Smelting and casting method of sulfur-containing and aluminum-containing gear steel

A technology of gear steel and converter smelting, which is applied in the field of smelting and casting, can solve the problems affecting fatigue life, cutting performance, nozzle blockage, etc., and achieve the effect of reducing aluminum loss and cost

Inactive Publication Date: 2020-08-04
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology

[0006] However, the above-mentioned technical solutions in the prior art will lead to the appearance of large Ds inclusions in steel grades (Ds inclusions refer to round or nearly round single particle inclusions with a diameter ≥ 13 μm), and the

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  • Smelting and casting method of sulfur-containing and aluminum-containing gear steel
  • Smelting and casting method of sulfur-containing and aluminum-containing gear steel
  • Smelting and casting method of sulfur-containing and aluminum-containing gear steel

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Embodiment Construction

[0037] The method for smelting and casting sulfur-containing and aluminum-containing gear steel according to the present invention will be further explained and described below in conjunction with specific examples. However, such explanations and descriptions do not constitute improper limitations on the technical solution of the present invention.

[0038] The smelting and casting method of the sulfur-containing and aluminum-containing gear steel of Examples 1-6 adopts the following steps for smelting and casting:

[0039] (1) Electric furnace or converter smelting: control the amount of slag ≤ 5kg / ton of steel in the tapping process, and control it to be C≥0.05wt% in molten steel at the end of smelting, and add Al element when tapping to make the Al in molten steel The content reaches 0.03-0.05wt%; and the S element content is controlled to be 0.015-0.035wt% at the end point of smelting, and the temperature at the end point of smelting is 1620-1670°C.

[0040] (2) LF refinin...

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Abstract

The invention discloses a smelting and casting method of sulfur-containing and aluminum-containing gear steel. The method comprises sequential steps as follows: (1), electric furnace or converter smelting; (2), LF refining; (3), VD or RH vacuum treatment; and (4), continuous casting. According to the method, in step (1), Al element is added during steel tapping, Al content of molten steel is enabled to reach 0.03wt%-0.05wt%; and furthermore, S element in the molten steel at the smelting end is controlled to in a range of 0.015wt%-0.035wt%; in step (2), following slag components are controlled:45wt%-55wt% of CaO, 20wt%-35wt% of Al2O3, 5wt%-10wt% of MgO and 10wt%-25wt% of SiO2; and in step (3), the Al element is added to the molten steel again after vacuum breaking, so that Al content of the molten steel reaches 0.03wt%-0.05wt%. When the smelting and casting method is used for smelting and casting, water nozzle clogging in a casting process can be effectively prevented.

Description

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Claims

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Application Information

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Owner BAOSHAN IRON & STEEL CO LTD
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